Relay.



No. 769,761. YPATENTED SEPT. 13, 1904. F. R. MGBERTY L H. M. CRANE.

RELAY.

APPLICATION FILED DEO. 15, 1902.

N0 MODEL.

@M WM Patented September 13, 1904.

UNITED STATES PATENT OFFICE.

FRANK R. MCBERTY, OF EVANSTON, ILLINOIS, AND HENRY M. CRANE, OF NEW YORK, N. Y., ASSIGNORS TO WESTERN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

RELAY.

SPECIFICATION forming part of Letters Patent No. 769,761, dated September 13, 1904. Application led December l5, 1902. Serial No. 135,342. (No model.)

T a/ZZ whom it may concern.-

l Be it known that we, FRANK R. MCBERTY, .residing at Evanston, in the county of Cook and State of Illinois, and HENRY M. CRANE,

residing at New York city, in the county and State of New York, citizens of the United States, have invented a certain new and useful Improvement in Relays, ot' which the following is a Jfull, clear, concise, and exact de- 1o scription.

Our invention relates toa relay more particularly for telephone-exchanges, and has for its object to provide an improved structure rwhich will be extremely compact and espe- 15 cially adapted to be mounted in the smallest possible square space, so that the largest possible number of relays may be mounted together within a given space upon the supporting-framework.

2o In modern telephone-exchanges large numbers of relays are necessary, and to economize space as well as to save wiring these relays are mounted side by side in horizontal rows upon suitable supporting-frames, a large number of such rows being provided one over the other, the space available for each relay being substantially square. Heretofore the contact parts of each relay and the conducting-straps leading thereto have been generally mounted at the top in a vertical plane passing through the center of the magnet, and this disposition of the parts has made it necessary to allow for each relay a square space considerably larger than would be required by 3 5 the tubular magnet alone.

Our invention is directed particularly toward an arrangement of the parts of the relay such that the size of the tubular magnet alone will be practically the only factor to consider in determining the size of the square space which will be required for each relay. Our idea is in general to dispose the contact parts and conducting-straps leading thereto at the corners of the square space which .is

occupied by the tubular magnet, whereby it is made possible with magnets of a given diameter to dispose the relays more compactly in a square space much smaller than that heretofore required.

Our invention further contemplates animprovenient in the arrangement by means of which the tension of the retracting-spring upon the armature is adjusted.

IVe will describe our invention more particularly by reference to the accompanying drawings, in which- Figure 1 is an end elevation of a relay constructed in accordance with our invention. Fig. 2 is a side elevation thereof. Fig. 3 is a plan view, and Fig. 4 is a vertical sectional 60 view, illustrating the adjustment of the spring tension upon the armature.

The same letters or' reference are used to designate the same parts wherever they are shown.

The magnet a is of the well-known tubular form which is generally adopted in telephoneswitchboard relays. The armature a is generally circular in form and is mounted in front of the end of the magnet in position to be attracted thereby, being pivoted at the bottom upon the screw-points b The relay shown is of a type having a front and back contact, and in accordance with our invention these contacts are disposed, as illustrated, in the corners of the squarespace to be occupied by the tubular magnet. Thus the circular armature carries the contact-screw c, mounted in a lug a2, projecting angularly from the edge of the circular armature. The corresponding 8O contact-anvil c is formed by the turned-up end of the conducting-strap CZ, whichis mounted upon the tubular shell of the magnet in alinement with projection (r2-that is to say, atthe corner of the square space to be occupied 8 5 by the magnet. The said conducting-strap may be secured in place by the screws d d and suitably insulated from said screws and from the metallic shell of the magnet by hardrubber washers, as shown. The back contact of the armature is formed by a contact-screw 02, mounted upon the turned-over end of a conducting-strap d2, which is mounted on the other side of the magnet in the other` upper corner of the square space to be occupied by said magnet. The strap Z2 may be mounted upon but suitably insulated from the magnetshell in the same manner as the strap CZ. The armature normally rests against the back contact-anvil Jformed by the contact-screw c2; but when attracted by the magnet is separated from said anvil, and the screw c, carried by said armature, is forced into Contact with the front anvil 0. The armature is yieldingly maintained in its retracted position by means of a retractile springe, which may be anchored atone end e/ to the, shell ot' the magnet and eonnected'at the other end to a lever-arm f, which is mounted upon the face of the armature. This lever-arm may be slotted to slide under the head of a screw gon the face of the armature and to be fastened thereby when the screw is tightened. A guiding-pin may also be provided on the face of the armature to be engaged by the slot of the lever-arm, so that the latter is kept in proper alinement. By loosening the screw g and sliding the leverarm f under the head of the same the outer end, to which the spring is connected, may` thus be adjusted toward or from the pivotal axis of the armature, whereby the tension of said spring upon the armature may be adjusted.

Having thus described our invention, we claim as new, and desire to secure by Letters Patent, the following:

l. In a relay, the combination with a magnet having a tubular shell and a corresponding substantially circular armature pivoted at the end of said shell, of acontact-arm carried by the armature, projecting angular-ly into the corner of the square space occupied by the armature, and a contact-anvil mounted in a corresponding position upon the tubular shell of the magnet.

2. The combination with a magnet and an armature pivotally mounted in front of the same, of a lever-arm slidably mounted upon the face of the armature so that its outer end may be adjusted toward or from the pivotal axis, and a retractile spring connected to the end of said lever-arm and suitably anchored, whereby the tension upon the armature may be adjusted.

3. In a relay, the combination with a magnet having a tubular shell and a substantially circular armature pivoted at the end of said shell, of metal conducting-straps mounted longitudinally upon but insulated from the tubular shell ofy the magnet, said straps lying at the corners of the square space occupied by the tubular shell of the magnet, contacts carried at the ends of said conducting-straps, and corresponding contacts carried by the armature.

4. The combination with a magnet and an armature pivoted in front of the same, of a slotted lever-arm lying across the face of the armature, a screw passing through the slot of the lever-arm into the face of the armature, said arm being adapted to slide under the head of the screw and to be fastened thereby when the screw is tightened, and a retractile spring connected to the end of the lever-arm, whereby the tension upon the armature may be adjusted.

Signed by the said` FRANK R. MCBERTY this 20th day of October, 1902, and by the said HENRY M. CRANE this 22d day of Cetober, 1902.

FRANK R. MCBERTY. HENRY M. CRANE. Witnesses to signature of McBerty:

ELLA EDLER, EDWIN H. SMYTHE. Witnesses to signature of Crane:

P. R. ZIEGLER, ROBERT WHITE, Jr. 

